# http.cookiejar --- Cookie handling for HTTP clients — DefaultCookiePolicy objects

> Implements the standard rules for accepting and returning cookies.

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-python-6c46c556b313b626174f>
- Knowledge kind: `reference`
- Confidence: `0.72`
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- Updated: `2026-08-16T09:32:14.537084+00:00`
- Tags: `reference-seed`, `python`, `library`, `http`, `cookiejar`, `cookie`, `handling`, `clients`, `defaultcookiepolicy`, `objects`

## Provenance

- Source: <https://github.com/python/cpython/blob/f10166035d602da5052e8a48f9d5c216c57b401d/Doc/library/http.cookiejar.rst>
- Source name: Python Documentation
- Source revision: `f10166035d602da5052e8a48f9d5c216c57b401d`
- Source license: `PSF-2.0`
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## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

Implements the standard rules for accepting and returning cookies.

Both 2965 and Netscape cookies are covered. RFC 2965 handling is switched off by default.

The easiest way to provide your own policy is to override this class and call its methods in your overridden implementations before adding your own additional checks

import http.cookiejar class MyCookiePolicy(http.cookiejar.DefaultCookiePolicy): def set_ok(self, cookie, request): if not http.cookiejar.DefaultCookiePolicy.set_ok(self, cookie, request): return False if i_dont_want_to_store_this_cookie(cookie): return False return True

In addition to the features required to implement the CookiePolicy interface, this class allows you to block and allow domains from setting and receiving cookies. There are also some strictness switches that allow you to tighten up the rather loose Netscape protocol rules a little bit (at the cost of blocking some benign cookies).

A domain blocklist and allowlist is provided (both off by default). Only domains not in the blocklist and present in the allowlist (if the allowlist is active) participate in cookie setting and returning. Use the blocked_domains constructor argument, and ~DefaultCookiePolicy.blocked_domains and ~DefaultCookiePolicy.set_blocked_domains methods (and the corresponding argument and methods for allowed_domains). If you set an allowlist, you can turn it off again by setting it to None.

Domains in block or allow lists that do not start with a dot must equal the cookie domain to be matched. For example, "example.com" matches a blocklist entry of "example.com", but "www.example.com" does not. Domains that do start with a dot are matched by more specific domains too. For example, both "www.example.com" and "www.coyote.example.com" match ".example.com" (but "example.com" itself does not). IP addresses are an exception, and must match exactly. For example, if blocked_domains contains "192.168.1.2" and ".168.1.2", 192.168.1.2 is blocked, but 193.168.1.2 is not.

DefaultCookiePolicy implements the following additional methods

Return the sequence of blocked domains (as a tuple).

Set the sequence of blocked domains.

Return True if domain is on the blocklist for setting or receiving cookies.

Return None, or the sequence of allowed domains (as a tuple).

Set the sequence of allowed domains, or None. …

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